[llvm] [AArch64][llvm] Add support for optional register in `SYS` alias instructions (PR #153905)

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git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp llvm/lib/Target/AArch64/MCTargetDesc/AArch64InstPrinter.cpp llvm/lib/Target/AArch64/Utils/AArch64BaseInfo.h
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View the diff from clang-format here.
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diff --git a/llvm/lib/Target/AArch64/Utils/AArch64BaseInfo.h b/llvm/lib/Target/AArch64/Utils/AArch64BaseInfo.h
index 971e3453b..857a3c73f 100644
--- a/llvm/lib/Target/AArch64/Utils/AArch64BaseInfo.h
+++ b/llvm/lib/Target/AArch64/Utils/AArch64BaseInfo.h
@@ -414,7 +414,8 @@ struct SysAliasOptionalReg : SysAlias {
   bool OptionalReg;
   constexpr SysAliasOptionalReg(const char *N, uint16_t E, bool R, bool O)
       : SysAlias(N, E), NeedsReg(R), OptionalReg(O) {}
-  constexpr SysAliasOptionalReg(const char *N, uint16_t E, bool R, bool O, FeatureBitset F)
+  constexpr SysAliasOptionalReg(const char *N, uint16_t E, bool R, bool O,
+                                FeatureBitset F)
       : SysAlias(N, E, F), NeedsReg(R), OptionalReg(O) {}
 };
 

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https://github.com/llvm/llvm-project/pull/153905